28319544 has 160 divisors (see below), whose sum is σ = 90169200. Its totient is φ = 8225280.

The previous prime is 28319539. The next prime is 28319549. The reversal of 28319544 is 44591382.

It is an interprime number because it is at equal distance from previous prime (28319539) and next prime (28319549).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28319499 and 28319508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28319549) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 206644 + ... + 206780.

Almost surely, 2^28319544 is an apocalyptic number.

28319544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28319544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45084600).

28319544 is an abundant number, since it is smaller than the sum of its proper divisors (61849656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28319544 is a wasteful number, since it uses less digits than its factorization.

28319544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 182 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 28319544 is about 5321.6110342640. The cubic root of 28319544 is about 304.8096779121.

The spelling of 28319544 in words is "twenty-eight million, three hundred nineteen thousand, five hundred forty-four".